Arcellx, Inc.
ACLXDelisted Apr 28, 2026- Industry
- Biological Products, (No Diagnostic Substances)
- SEC CIK
- 0001786205
Arcellx, Inc. was delisted on Apr 28, 2026; its insiders filed their last Form 4 on Apr 28, 2026; 240 institutions reported holding it in 13F filings for Q1 2026, worth $6.52B in total; Soros Fund Management was the only superinvestor holding it.
Holders of 5% or more of ACLX
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Arcellx, Inc., largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| T. Rowe Price Investment Management, Inc. | 13G/A | 16.60%9.60M shares | +5.30 ppfrom 11.30% | Sep 8, 20252 filings | Dec 5, 2025 | SEC |
| FMR LLC | 13G/A | 10.40%5.76M shares | −1.10 ppfrom 11.50% | Feb 12, 20253 filings | Nov 5, 2025 | SEC |
| Vanguard Group Inc | 13G/A | 7.25%3.99M shares | +1.10 ppfrom 6.15% | Jan 30, 20252 filings | Apr 30, 2025 | SEC |
| Elghandour Rami | 13D/A | 6.90%4.00M shares | – | Feb 27, 20251 filing | Feb 27, 2025 | SEC |
| BlackRock, Inc. | 13G/A | 6.40%3.53M shares | – | Apr 17, 20251 filing | Apr 17, 2025 | SEC |
| New Enterprise Associates 15, L.P. | 13D/A | 5.51%3.06M shares | −1.29 ppfrom 6.80% | May 12, 20252 filings | Aug 14, 2025 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
13 Schedule 13D and 13G filings on Arcellx, Inc., newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Dec 5, 202512:52 PM ET | T. Rowe Price Investment Management, Inc. | 13G/A | 16.60%9.60M shares | +5.30 ppfrom 11.30% | Nov 30, 2025 | SEC |
| Nov 5, 202511:26 AM ET | FMR LLCand 1 other | 13G/A | 10.40%5.76M shares | −1.10 ppfrom 11.50% | Sep 30, 2025 | SEC |
| Sep 8, 20251:36 PM ET | T. Rowe Price Investment Management, Inc. | 13G | 11.30%6.28M shares | New | Aug 31, 2025 | SEC |
| Aug 14, 20259:15 PM ET | New Enterprise Associates 15, L.P.and 6 others | 13D/A | 5.51%3.06M shares | −1.29 ppfrom 6.80% | Aug 12, 2025 | SEC |
| Aug 14, 20254:20 PM ET | Perceptive Advisors LLCand 2 others | 13G/A | 4.50%2.48M shares | −0.80 ppfrom 5.30%Below 5% | Jun 30, 2025 | SEC |
| May 15, 20254:30 PM ET | Perceptive Advisors LLCand 2 others | 13G/A | 5.30%2.93M shares | – | Mar 31, 2025 | SEC |
| May 12, 20254:15 PM ET | New Enterprise Associates 15, L.P.and 7 others | 13D/A | 6.80%3.75M shares | – | May 8, 2025 | SEC |
| May 12, 202510:24 AM ET | FMR LLCand 1 other | 13G/A | 11.50%6.30M shares | −3.20 ppfrom 14.70% | Mar 31, 2025 | SEC |
| Apr 30, 202510:55 AM ET | Vanguard Group Inc | 13G/A | 7.25%3.99M shares | +1.10 ppfrom 6.15% | Mar 31, 2025 | SEC |
| Apr 17, 20259:35 AM ET | BlackRock, Inc. | 13G/A | 6.40%3.53M shares | – | Mar 31, 2025 | SEC |
| Feb 27, 20254:23 PM ET | Elghandour Rami | 13D/A | 6.90%4.00M shares | – | Feb 27, 2025 | SEC |
| Feb 12, 20259:16 AM ET | FMR LLCand 1 other | 13G/A | 14.70%7.96M shares | – | Dec 31, 2024 | SEC |
| Jan 30, 20259:34 PM ET | Vanguard Group Inc | 13G | 6.15%3.33M shares | New | Dec 31, 2024 | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell Arcellx, Inc. shares.
No Form 144 notices for Arcellx, Inc. are on file.